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counter: Introduce the Signal polarity component

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The Signal polarity component represents the active level of a
respective Signal. There are two possible states: positive (rising edge)
and negative (falling edge); enum counter_signal_polarity represents
these states. A convenience macro COUNTER_COMP_POLARITY() is provided
for driver authors to declare a Signal polarity component.

Cc: Julien Panis <jpanis@baylibre.com>
Link: https://lore.kernel.org/r/8f47d6e1db71a11bb1e2666f8e2a6e9d256d4131.1664204990.git.william.gray@linaro.org/
Signed-off-by: William Breathitt Gray <william.gray@linaro.org>
Link: https://lore.kernel.org/r/b6e53438badcb6318997d13dd2fc052f97d808ac.1664318353.git.william.gray@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
William Breathitt Gray
2022-09-27 18:53:38 -04:00
committed by Greg Kroah-Hartman
parent 7bbf842cdc
commit 650ae67bbf
5 changed files with 43 additions and 0 deletions
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10
include/linux/counter.h
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@@ -31,6 +31,7 @@ enum counter_comp_type {
COUNTER_COMP_ENUM,
COUNTER_COMP_COUNT_DIRECTION,
COUNTER_COMP_COUNT_MODE,
COUNTER_COMP_SIGNAL_POLARITY,
};
/**
@@ -477,6 +478,15 @@ struct counter_available {
#define COUNTER_COMP_FLOOR(_read, _write) \
COUNTER_COMP_COUNT_U64("floor", _read, _write)
#define COUNTER_COMP_POLARITY(_read, _write, _available) \
{ \
.type = COUNTER_COMP_SIGNAL_POLARITY, \
.name = "polarity", \
.signal_u32_read = (_read), \
.signal_u32_write = (_write), \
.priv = &(_available), \
}
#define COUNTER_COMP_PRESET(_read, _write) \
COUNTER_COMP_COUNT_U64("preset", _read, _write)